Kuwabara K, Yoshihara R, Hatakeyama S, Tanaka S. Analysis of localization of cell-cycle regulators in Neurospora crassa.
Fungal Biol 2020;
124:613-8. [PMID:
32540184 DOI:
10.1016/j.funbio.2020.02.017]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 02/21/2020] [Accepted: 02/25/2020] [Indexed: 11/20/2022]
Abstract
Most fungi are multinucleated organisms. In some fungi, they have asynchronous nuclei in the same cytoplasm. We analyzed a cell-cycle regulation mechanism using a model fungus Neurospora crassa, which can make heterokaryon cells. G1/S cyclin CLN-1 and cyclin-dependent kinase CDC-2 were tagged with different fluorescence in different strains and expressed. By forming a heterokaryon strain of these, two different fluorescence-tagged proteins were expressed in the same cytoplasm. CDC-2 was localized in all nuclei, whereas CLN-1 was not detected in most of the nuclei and was dispersed in the cytoplasm with small granular clusters. This indicates that in multinucleated fungi, cell-cycle regulators, similar to other proteins, are shared around the nuclei regardless of different cell-cycle stages. Moreover, each nucleus can select and use a special cell-cycle regulator only when it is necessary. Fungal nuclei may have a novel pickup mechanism of necessary proteins from their cytoplasm at the point of use.
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